Author/Authors :
Su, Yichang Key Laboratory of Automobile Materials - Ministry of Education - College of Materials Science and Engineering - Jilin University - Changchun , China , Su, Yingchao Key Laboratory of Automobile Materials - Ministry of Education - College of Materials Science and Engineering - Jilin University - Changchun , China , Zai, Wei Key Laboratory of Automobile Materials - Ministry of Education - College of Materials Science and Engineering - Jilin University - Changchun , China , Li, Guangyu Key Laboratory of Automobile Materials - Ministry of Education - College of Materials Science and Engineering - Jilin University - Changchun , China , Wen, Cuie School of Engineering - RMIT University - Melbourne - VIC , Australia
Abstract :
In order to decrease the degradation rate of magnesium (Mg) alloys for the potential orthopedic applications, manganese-calciumphosphate coatings were prepared on an Mg-Ca-Zn alloy in calcium phosphating solutions with different addition of Mn2+.Influence of Mn content on degradation behaviors of phosphate coatings in the simulated body fluid was investigated to obtainthe optimum coating. With the increasing Mn addition, the corrosion resistance of the manganese-calcium phosphate coatingswas gradually improved. The optimum coating prepared in solution containing 0.05 mol/L Mn2+had a uniform and compactmicrostructure and was composed of MnHPO4⋅3H2O, CaHPO4⋅2H2O,andCa3(PO4)2. The electrochemical corrosion test insimulated body fluid revealed that polarization resistance of the optimum coating is 36273Ωcm2, which is about 11 times higherthan that of phosphate coating without Mn addition. The optimum coating also showed the most stable surface structure and lowesthydrogen release in the immersion test in simulated body fluid.
Keywords :
In Vitro Degradation Behaviors , Manganese-Calcium , Phosphate Coatings , Mg-Ca-ZnAlloy , magnesium (Mg)
